With all due respect, your fix doesn't work.
First, I should tell you that I have Windows 8 and Autocad 2012 with a downloaded zip file from Autodesk.
Second, my error message is for the .net frameowork, which I assume is because 4.5 is part of the new operating system and it won't allow any installation of 4.0. I tried installing 4. directly from Microsoft, but that wasn't allowed either.
This is what I did:
1. I deleted all the dot 4 references. That didn't work.
2. I replaced your setup.ini file that you provided in the thread with the original, but that didn't work.
3. After I realized that when the program is unzipping, it replaces the setup.ini file that I changed back to the original one, so I waited until it stopped unzipping to replace it. That didn't work.
Are there two setup.ini files?
But I doubt that is the problem. I am getting the setup.ini file in the main folder of the Archicad file. It is right under the setup.exe file.
4. I tried using every compatibility settings going back to XP. That didn't work.
Lastly, I have played with turning on and off the .net framework programs, but that doesn't worh either.
If my post was helpful, please give 
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